When there was a NULL value grouping key, it would show up in the legend as 
<NULL> but would show in the rich tooltip as an empty string. I added an if 
statement so that the NULL value will show up as <NULL> in the rich tooltip, as 
it appears in the legend.

Before:
![screen shot 2018-09-28 at 11 50 14 
am](https://user-images.githubusercontent.com/10524577/46219789-42126a00-c316-11e8-9a22-356a8685aff1.png)

After:
![screen shot 2018-09-28 at 11 52 57 
am](https://user-images.githubusercontent.com/10524577/46219799-48084b00-c316-11e8-874a-c5adce03754c.png)



[ Full content available at: 
https://github.com/apache/incubator-superset/pull/6003 ]
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